Myr Battlesphere
Artifact Creature - Myr Construct
| Power/Toughness:
4 / 7
(CMC 7)
When Myr Battlesphere enters the battlefield, create four 1/1 colorless Myr artifact creature tokens.
Whenever Myr Battlesphere attacks, you may tap X untapped Myr you control. If you do, Myr Battlesphere gets +X/+0 until end of turn and deals X damage to the player or planeswalker it's attacking.
- [C13] Commander 2013 #247 (R)